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Revision Notes

Matter in Our Surroundings

CBSE · Class 9 · Science

Quick revision notes for Matter in Our Surroundings — CBSE Class 9 Science. Key concepts, formulas, and definitions for last-minute revision.

27 questions25 flashcards5 concepts

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A flowchart illustrating the processes by which matter changes from one state to another (solid, liquid, gas) and the conditions (temperature, pressure) that facilitate these changes.
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Key Topics to Revise

1

Physical Nature of Matter

  • Matter is made up of tiny particles - this was proven through dissolution experiments with salt/sugar in water
  • Particles of matter are extremely small - demonstrated by potassium permanganate dilution experiment where few crystals can color 1000L of water
  • Ancient Indian philosophers classified matter as 'Panch Tatva' - air, earth, fire, sky, and water
2

Characteristics of Particles of Matter

  • Particles have space between them - shown by sugar/salt dissolving in water without increasing water level
  • Particles are in continuous motion (kinetic energy) - increases with temperature
  • Particles attract each other with varying force strength - strongest in solids, weakest in gases
3

States of Matter

  • Three states: Solid, Liquid, Gas - differ in particle arrangement and movement
  • SOLIDS: Fixed shape, fixed volume, negligible compressibility, particles closely packed with strong attraction
  • LIQUIDS: No fixed shape, fixed volume, particles can move freely but still attracted to each other
4

Change of State

  • States can change by altering temperature or pressure
  • MELTING: Solid to liquid at melting point (273 K for ice)
  • BOILING: Liquid to gas at boiling point (373 K for water)

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Full Notes

Key Concepts

All matter is composed of extremelyParticles of matter have three mainMatter exists in three statesMatter can change from one stateThe process where liquid changes

Frequently Asked Questions

What are the important topics in Matter in Our Surroundings for CBSE Class 9 Science?
Matter in Our Surroundings covers several key topics that are frequently asked in CBSE Class 9 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Matter in Our Surroundings — CBSE Class 9 Science?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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